Pin cushion



FIG. 1 is a perspective view of a pin cushion showing my new design;

FIG. 2 is a side elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a perspective view of a pin cushion showing a modification of my new design;

FIG. 6 is a side elevational view thereof;

FIG. 7 is a top plan view thereof;

FIG. 8 is a bottom plan view thereof. 

The ornamental design for a pin cushion, substantially as shown and described. 